English

Abstract

BACKGROUND Endodontically treated teeth have higher fracture rate due to pronounced coronal destruction. The minimally invasive approach of associating adhesive techniques and posts seems to contribute to a better clinical prognosis for endodontically treated teeth. The purpose of this study was to evaluate the push out bond strength and mode of failure of fiber post using one self-etch resin cement and two selfadhesive resin cements. METHODS Sixty single rooted teeth were selected and decoronated 2 mm coronal to cementoenamel junction (CEJ). The teeth were prepared and obturated, then divided into three groups of 20 samples each. The post spaces were prepared and relyX fiber posts were cemented in group I with multilink N, in group II with relyX U200 and in group III with Maxcem elite luting cements. The specimens were sectioned into three slices of 2 ± 0.1 mm thickness to perform the push out test using universal testing machine. Failure modes were evaluated using scanning electron microscope. Thus, collected data was statistically analysed using one-way analysis of variance test. RESULTS The push out bond strength of group I was significantly higher than that of group II and group III (P < 0.05). No statistically significant difference was found between group II and group III. There was significant difference between coronal, middle and apical thirds in each group. The mode of failures showed 78 % of the samples had adhesive failure while 22 % of the samples had mixed failure. CONCLUSIONS Multilink N was found to be significantly more effective than RelyX U200 and Maxcem elite. Most common type of failure observed was adhesive failure between dentine-cement interface. KEY WORDS Fiber Post, Self-Etch Cement, Self-Adhesive Cement, Bond Strength, Push Out Test